HMRC Form CA3822: Application for a Certificate of Continuing Liability for National Insurance (A1 / Posted Workers)
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JustFill is not affiliated with HM Revenue & Customs (HMRC), United Kingdom. This is an independent third-party tool to help you complete HMRC Form CA3822. Always download the current blank form from the official source and verify your completed copy before signing or submitting. Official HMRC Form CA3822 from HM Revenue & Customs (HMRC), United Kingdom
HMRC Form CA3822 is the UK employer application for a Certificate of Continuing Liability (commonly called an A1 certificate or Certificate of Coverage) when a UK employer sends an employee to work temporarily in an EU member state, Gibraltar, Iceland, Liechtenstein, Norway, Switzerland, or a country with a reciprocal social security agreement. An approved certificate keeps the worker within UK Class 1 National Insurance and exempts them from host-country social security contributions. Complete the CA3822 worksheet or uploaded PDF in JustFill and download it in one click.
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Seconding or posting a UK employee to an EU member state, Switzerland, or EEA country for a temporary assignment? Without a Certificate of Continuing Liability (A1), both the employer and employee may be required to pay social security contributions in the host country from day one. Form CA3822 captures the UK employer’s PAYE reference and economic activity in the UK, the employee’s National Insurance number and prior UK NI history, and the exact host-country work location and assignment dates. JustFill lets global mobility, HR, and tax teams complete CA3822 cleanly in the browser or batch-fill applications for travelling project teams.
HMRC guidance for Form CA3822 is available on GOV.UK at gov.uk/guidance/tell-hmrc-about-employees-going-to-work-in-the-european-economic-area-ca3822. Click "Fill the blank Form CA3822 now" above to open a 1-page CA3822 worksheet in JustFill, or upload your own CA3822 PDF.
What each section of HMRC Form CA3822 asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.
Company name, UK registered address, Employer PAYE reference, Accounts Office reference, business sector, and confirmation of substantial business activity in the UK.
Employee full name, date of birth, nationality, UK residential address, National Insurance number, and confirmation that they were subject to UK NI immediately before the posting.
Destination country, start and end dates of the posting, name and address of the host entity, client site, or vessel, and confirmation of whether the worker replaces another posted worker.
Authorised signatory name, position, phone number, email, signature, and date.
A fictional UK engineering firm in Leeds posts a senior commissioning engineer to a client project in Munich, Germany for a 6-month assignment while keeping him on the UK payroll and UK National Insurance. All names and numbers are fictional.
Employer: Sample Northern Grid Ltd, 40 Wellington St, Leeds LS1 2DE · PAYE Ref: 456/LN78901
Establishes that the employer habitually carries out substantial activities in the United Kingdom.
Employee: SAMPLE, MARCUS DAVID · DOB: 12/06/1987 · Nationality: British · NI No: QQ 65 43 21 A · Subject to UK NI prior to posting: Yes
Confirms the employee was covered by UK social security legislation immediately before the posting.
Country: Germany · Period: 01/11/2026 to 30/04/2027 · Host Site: Sample Bayern Energie GmbH, Leopoldstraße 80, 80802 München · Replacing another posted worker: No
Shows the assignment is under 24 months and does not replace another detached worker.
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Official source: HMRC Form CA3822 on HM Revenue & Customs (HMRC), United Kingdom’s website
Edition checked: HMRC CA3822 (Employer Application for Certificate of Continuing Liability). Verified against the official source on · Verified in our Government Forms Fillability Study.
Contains public sector information licensed under the Open Government Licence v3.0.
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